<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>转圈圈</title>
    <style>
        body{
            background-color: black;
        }
        .box1{
            width: 300px;
            height: 300px;
            margin: 0 auto;
            border: 2px solid ghostwhite;
            border-radius: 50%;
            position: relative;
            animation: rotate 4s linear infinite;
        }
        .box2{
            width: 20px;
            height: 20px;
            background-color: ghostwhite;
            border-radius: 50%;
            top: 0;
            left: 140px;
            position: absolute;
        }
        @keyframes  rotate{
            from{
                transform: rotate(0deg);
            }
            to{
                transform: rotate(360deg);
            }
        }
    </style>
</head>
<body>
    <div class="box1">
        <div class="box2"></div>
    </div>
</body>
</html>